Family Tree 2

One day, a college student named Tina walked into her logic class and waited for her fun day of logic once again. Finally the professor, Professor C. D. Rock, walked in saying, "I just went through some stuff and stumbled upon an old family tree, that belonged to my grandparents, that gave me an idea. I have here a few clues, and you have to use them to figure out their family tree!"

Tina then gets the clues, and tries to work them out. Unfortunately this puzzle is a little harder than the normal ones Professor C. D. Rock gives out. Can you help her?

The family tree consists of two grandparents, who had 3 children, each of whom get married and have 2 children.

I had a lovely time making the Rock family tree. I even drew the heads of everyone just because I have a lot of free time But isn't also possbile that Neil and Katherine had Tammy as a daughter? Anyway, good teaser